20940018 has 24 divisors (see below), whose sum is σ = 46035024. Its totient is φ = 6345240.

The previous prime is 20939999. The next prime is 20940043. The reversal of 20940018 is 81004902.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20940018.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13696 + ... + 15147.

It is an arithmetic number, because the mean of its divisors is an integer number (1918126).

Almost surely, 2^20940018 is an apocalyptic number.

20940018 is an abundant number, since it is smaller than the sum of its proper divisors (25095006).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20940018 is a wasteful number, since it uses less digits than its factorization.

20940018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28870 (or 28859 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 24.

The square root of 20940018 is about 4576.0264422313. The cubic root of 20940018 is about 275.6294912910.

The spelling of 20940018 in words is "twenty million, nine hundred forty thousand, eighteen".